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The chemical formula of mineral Bieberite is indicated by CoSO4•7(H2O). This mineral is usually found at its type of locality at Bieber, Hessen, Germany. Mineral Bieberite was named after its original locality. Mineral Bieberite is known to crystallize in the monoclinic system of crystal formation. In optical mineralogy, the monoclinic system of crystal formation comprises crystals having three axes of unequal lengths. Two of which are usually found in a position that is oblique or not perpendicular to one another. However, both of which are commonly found perpendicular to the third axis.

            Mineral Bieberite is usually found showing perfect cleavage in one direction which can be found more clearly visible when viewed closely under polarized microscope used in the field of optical mineralogy. Bieberite is also commonly found colored pinkish red or fleash pink in hand sample. The specific gravity measure of the mineral is usually found 1.9 grams per cubic centimeters. Most crystals of mineral Bieberite are found translucent in appearance. Bieberite is also most commonly found showing uneven fracture when viewed closely in reflected light of polarizing microscope used in the field of optical mineralogy. The crystal habit of mineral Bieberite as described in the field of optical mineralogy usually includes encrustations forming crust-like aggregates on matrix. It can be also found stalactitic or shaped like pendant columns as stalactite or stalagmites. The hardness measure of mineral Bieberite is usually found 2 when mineral is evaluated using the Mohs scale method. It is also found exhibiting vitreous to dull luster if evaluated in reflected light of polarizing microscope used in the field of optical mineralogy. This mineral is most commonly found leaving a white streak if rubbed on white porcelain streak plate. Bieberite is commonly found showing biaxial negative figure when evaluated closely between crossed nicols of petrographic polarizing microscope. This mineral is also commonly found showing 0.0120 birefringence. Bieberite is non-radioactive as evaluated.



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Friday, November 26th, 2010 at 3:47 pm
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Optical Mineralogy
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